Centrifugal fan or pump.



M. G. HUBBARD.

GENTBIFUGAL FAN 0B PUMP.

APPLICATION FILED an 29, 1908 902,533. Patented Oct. 27, 1908.

2 BKEETS-SHEET 1.

W/T/VESSES" ,INVENTOR mg & M n 4 (fa/24,

M. G. HUBBARD.

GENTBIFUGAL FAN OR PUMP.

APPLICATION FILED MAY 29 1908. 902,533. Patented 0011.27, 1908. 2 SHEETS-SHEET 2.

' INVENTOR M g/ n64 ddd h'fi WITNESSES:

v UNITED srnrns rATnntr OFFICE.

MOSES G. HUBBARD,- OF OHATHAM, NEW

JERSEY, ASSIGNOR TO MECHANICAL UTILITIES COMPANY, NEW YORK, N. Y., A CORPORATION OF NEW YORK.

rm' rm;

Specification of Letters Patent;

Patented Oct; 2'7, mos.

To all whom it may concern:

Be it known that I,.Mosns G. HUBBARD, a

citizen of the United States,

residing at Chatham, county of Morris, and State of New J or- 5 sey, have invented certain new and useful Improvements in Centrifugal Fans orPumps,

of which the} following is a s cificatlon.

This invention relates to t trifugal fans or pumps, in which circum erentially.

at class of conthe fluid acted u on is taken in axially and discharged In this type of centrifu gal fan or pum thp rotary member is usually formed wit aarge number of thin blades arranged in drum form.

structing the rotary member in this typp fan,.the blades have in-the past usually arallel concan

made of separate pieces suitably attached to the heads or other parts of a rotating frame, which construction is objectionable on account of-the relatively ture, and because of the limitations to large cost of manufacthe number of blades that can be effeetivel.

mounted within a given circumference.

has also been-suggested that the blades be metal, but,

formed by stamping or punching out sheet so far as I am aware, no practical out thi obviates the statedlimitations as to the number and circumference.

size of blades that can be mounted in a given The object of my present invention is to simplify and improve rotary member of this or pump, with a view the construction of the type of centrifugal fan to reducing the cost of manufacture and increasing its efiiciency. T 0 this endl propose to construct an adjustably connected series of blades for the rotary member of a centrifugal fan orpump,

y means which will permit the mounting of a relatively larger number of blades in a rotary member of a given circumference.

My invention comprises a series of blades or leaves connected at their 4 5 crimped transverselygated formto present the lation, the entire series ends with uniting strips which are capable of being bent or into zigzag or corrublades in proper rebeing then formed into the propershape-and suitably mounted between heads which the rotar member supporting sha constituting or pump, 1. take. a. strip of? the frame by is secured upon its. In the preferredmethod of constructing-my improved centrifugal. fan; sheet; metal. of?

proper length and width, and by a cutting or stamping operation, form in the strip the desired number of internal blades or leaves, all of which are connected at their ends to the body of the strip. These blades or leaves are then bent withrelation to the body of the strip to place them at the desired angle, and to give them the re ired concave or other shape, and the portions of the strip, from which parts of the ends of the blades or leaves have been severed, are then crimped or bent transversely to present the succession of blades or leaves 1n the desired close relation. llhe integrally connected series of blades or leaves formed in this way is then sha ed'into drum form and fastened between the ads of the rotary member by any suitable fastening devices.

Mypinvention can be carried out by forming t GhlfldGSiOT'lBEVBS separately and riveth1g1 themiattheir'ends to the uniting strips be ore said strips are" bent or corrugated to present theblades or leaves in proper relation. I can also carry. out my invention by stamping or punching several ieces of sheet meta to form a plurality 0 segments of blades or leaves which are secured together b riveting the sections of uniting strips or e ge walls before corrugating. I prefer, however, to form the blades or leaves and uniting stri s from a single integral piece of sheet meta. Without regard to the particular form of the structure for carrying out my invention, it will beunderstood that the essential feature is the adjustable uniting strip by which the blades or leaves are presented in the desired. close relationship, and by which the number of blades or leaves can be greatly increased inadrum of a given circumference.

In order that my invention may be fully understood, I will first describe the same with reference to the accompanying drawings, and afterwards point out the novelty more clearly in the annexed claims.

In said drawings Figure 1 is a vertical transverse sectional view of a rotary fan or blower constructed in accordance with my invention and showing the same applied in a snail shell'form of easing. Fig. 2 is a vertical longitudinal sectional view 'of the same. Fig. 3 is a vertical longitudnal sectional view of m improved fan. or pump showing a mod' ed arrangement'of casing and mountform shown in view of part of a blank strip of sheet metal having a number of blades or leaves out therein. Fig. 6 is a similar view illustrating the blank after it has been crimped or bent into final sha e. Fig. 7 is a detail transverse sectiona view of part of the rotary member of my improved fan or um showing the arrangement of the para el b ades or leaves. Fi 8 is a detail v1ew illustratin a hook bolt En fastening the series of bla es between the heads of the rotary member, and Fig. 9 is a detail'plan view of a slight modification.

In constructing my improved rotary fan or blowerI take a long strip of the proper kind of sheet metal havin the required length and width to fproduce t efan of the desired size, a

portion 0 which strip is illustrated at 1 in Fig. 5 of the drawings, and by an approved cutting or stamping rocess I orm a series of parallel elongated lades or leaves, indicated at 5, 5, 5, &c. These blades or leaves are formed entirely within the edges of the blank 1, their ends being formed partly by the short lon itudinal cuts (1., arranged parallel with the ength of the blank strip 1, and partly by the edges of the blank, and their longitudinal edges being formed by the long cuts I) extending at right angles to the len th of the blank strip 1. Each blade or lea 5 is integrally.

connected with the edge portion '0 of the body of the blank 1, said edge portion 0 constituting adjustable uniting strips as hereinafter explained.

After the blank has been cut in the manner described, the cut blank is subjected to a crimping or bending operation to bend transversely the edge ortions or uniting strips 0 of the blank, said uniting strips being bent alternately up and down upon lines extending transversely of the blank substantially coincidently with the ends of the short cuts a. This crimping or bending operation effects the transverse corrugation of the uniting strips 0 and renders said unitin strips adjustable in length, since it is possib e to increase or decrease the several bends to pre-' sent the several blades or leaves closer together and farther apart. This crimping or bending operation presents the several blades or leaves in approximately their proper angular relation, although the blades or leaves may alsov be curved or otherwise shaped. The blank bent in this form is shown in Figs. 6 and 7, from which views it will be observed that the inner and outer edges of each blade or leaf 5 is formed by two ad acent cuts 1) in the blank. It will also be observed from the drawings that the entire surface of the blank strip within the short longitudinal cuts a is utilized as blade surface, and that each blade is integrally connected at its opposite ends for a portion of its width with uniting strip portions of the body of the blank.

In Fi 7 of the drawings, I have shown a modifie form of the invention, in which the blades or leaves 5 are made of separate parts, each being formed with inte al lugs or flan es 5 at its opposite ends, w ich are rivete or otherwise rigidly secured to the separate adjustable uniting strips 0. In carrying out the invention in this form, it will of course be understood, that the blades or leaves are secured to the uniting strips the proper distances a art, and the uniting strips are then subjecte to the crimping or bending operation to shape and present'the several blades or leaves in pro er relation.

It will, of course, be un erstood that the width of the several blades or leaves must be determined upon to suit the requirements of the particular fan or pump that is to be constructed. In the preferred form of the invention, if it should prove desirable to form the blades or leaves narrower than would resuit from the mere stamping or cutting of the blank as explained, it will, of course, be understood that a portion of the width of each blade or leaf may be cut off. This cutting away of a part of each blade or leaf will ordinarily be unnecessary, since by proper calculation, the width of the blades or leaves can be arranged to meet the proper requirements.

The series of blades formed as 'ust described, are mounted in drum form etween two circular heads best shown in Figs. 1 and 2. The main supporting head 10 is formed integral with a conical end 11, which is suitably flanged and mounted upon a hub 12, which is secured in the usual way to a supporting shaft 13. This circular head 10 is preferably formed with an inturned annular ange 10*, for the purpose of fitting over one of the corrugated uniting strips of the series of blades or leaves. The opposite circular head 15 is formed with inner and outer annular flanges 15 and 15", which fit over the opposite corrugated uniting strip of the series of blades or leaves. When the series of blades or leaves in drum form has been placed between the heads 10 and 15, a suitable number of hook bolts 20, such as shown in detail in Fig. 8, is arranged as shown to engage the uniting strip portions 0 of the series of blades at intervals, and passed through suitable openings in the heads to receive nuts by which the heads and series of blades are rigidly secured together to form the rotary member of the fan or pump. It will, of course, be understood that any suitable means may be em loyed for mounting the series of blades or Feaves in the desired adjusted relation within the heads or other rotating frame.

In Fig. 2 I have shown the rotary fan or pump provided with a plurality of propeller ike lades 25, which extend approximately radially from the hub 12 to the inner edge of r surrounding the fan or umg proved construction. The structure teams the head 15. These blades serve to assist the action of the fan or pump by drawing the fluid into the eye of the rotary member. These blades 25' also act as spokes for bracing the circular head 15 upon the hub 12, thereby.

producing a more rigid structure for the ro- 31, from which it is forced through the outlet 32. In this adaptation of my invention, the shaft 13 of the rotary member may be suitably journaled at in the standard 36, and supplied with a driving pulley 37, although the fan may be driven in any approved man ner.

In Figs. 3 and 4 I have shown my improved centrifugal fan or ump a plied to the form of casing adapted or win ow ventilation, as shown in my pending ap lication iiled No. vember 25th, 1907, Seria No. 403,632. In this adaptation of my invention, represents the casing adapted to be mounted in the window frame, with the screened inlet end 41 leading from the outer air. A centrifugal fan or pump 45 is mounted directly upon the motor shaft 46 of the electric motor 47,-hung within the casing by the yoke frame 48. Adjacent to the outlet end of the casing 40, and

45, is an annular inwardly curved de ecte wall 50, having an air inlet 51, through which the air passes to the eye of the fan or pump 45. This deflecting wall serves the double function of directing the incoming air to the eye of the rotary fan or pump, and of deflecting the centrifugally discharged air outwardly into the room to be ventilated.

There are many advantages in my imis simple and economical in manufacture, and at the same time is strong, durable and efficient. The economy in manufacture is not only due to the facility with which the parts can be made and assembled, but also to the fact that there is no waste of material in constructin the device. Substantially the whole 0 the surface area of the blank from whichthe series of blades is made, is utilized as active surface in the rotary fan or pum With my im roved construction it is possibl to arrange the blades or leaves of the rotary member as close together or as far apart as may be desired, by bending the intervening uniting strips more or less, so that within a given circumference of the rotary member any desired number of blades or leaves may be arran ed, it being simply necessary to start wit the required length of blank (or length of uniting strips) and bend the uniting less to suit the strips connecting the several blades more or dlmensions of the pump to be constructed.

As showing the increased efficiency of my improved construction of centrifugal fan or pump, I would call attention, in addition to the acility for effectively increasing the number of blades or leaves in a rotary member of a given circumference, to the fact that in forming scribed, I am able to obtain the sharp cuttin edge at the outer edge of each blade or lea a feature of great importance in connection with the efliciency of a fan or pump of this type.

What I claim is:

1. In a fan or pump, the combination of a plurality of blades or leaves, with a uniting strip connected with all of said blades or leaves and bent between its connections with said blades or leaves to determine the relative position of said blades or leaves.

2. A centrifugal fan or pump having a rotary member comprising a plurality of blades or leaves connected which is bent alternately up and down in a zigzag form, as set forth.

3; A centrifugal fan or pump having a rotary member comprising a suitable frame. a

lurality of blades or leaves, corrugated uniting strips connecting said blades or leaves, and means for securin said connected blades or leaves within said rame.

4. A centrifugal fan or pump having a rotary member comprising a sheet of metal, having a series of transverse arallel cuts between its edges and bent to form a series of substantially parallel blades whose upper and lower edges are defined by said transverse cuts.

5. A centrifugal fan or pum having a rotary member comprising a s ieet of metal having a series of transverse parallel cuts between its ed es and two series of longitudinal cuts parallel with its edges, said sheet of metal being bent to form a series of substantially parallel blades whose upper and lower edges are defined by adjacent transverse cuts.

6. A centrifugal fan or pum having a rotary member comprising a sheet of metal stamped or cut to orm a plurality of blades or leaves wholly within its edges, and uniting strips or end walls, said blades or leaves hav' ing stamped or cut upper and lower edges, and said end walls being bent to present said blades or leaves in roper relation.

7. A centrifugal an or pump having a rotary member com rising a sheet of metal stamped or cut to fbrm a plurality of blades or leaves wholly within its edges, and unitin stri s or end walls corrugated to present said bla es or leaves in proper relation, said connected series of blades or leaves being shaped into drum form, as set forth.

with a uniting strip, 1

the blades or leaves as above deor leaves wholly stri s or end wa 1s 8. A centrifugal fan or pum having a retary member comprising a s meet of metal stamped or cut to orm a plurality of blades within 1ts edges, umtin corrugated to present sai bla es or leaves in roper relation, said connected series of NM es or leaves bein shaped into drum form, and heads secure( to said drum of blades or leaves, as set forth.

9. In a centrifugal fan or pump, a strip of metal cut to form a plurality of blades or leaves and bent in drum form, in combination with'heads fitting upon the opposite ends of said drum of blades or leaves, and means for securing said heads in position thereon.

10. In a centrifu' a1 fan or pump, a blank cut to form a plura 'ty of internal blades or leaves and crimped or bent along its edge walls, in combination with heads, and hook bolts for securing said blank in drum formbetween said heads.

11. A centrifugal fan or pump, having a rotary member comprising a plurality of blades or leaves in drum form connected at their ends with zigzag or corrugated unitin strips, heads fitting over sai corrugate uniting strips, and hook-bolts enga ing said uniting strips and passing through said heads, as set forth.

12. A centrifugal fan or pump, having a rotary member comprising a plurality of blades or leaves in drum form connected at v securing their ends with zi zag or corrugated uniting stri s, annularly sai corrugated uniting strips, and means for said heads thereon, as set forth.

13. centrifugal fan or pump, having a rotary member comprising a plurality of blades or leaves in drum form connected at their ends with zigzag or corrugated uniting strips, and flanged heads secured to the ends of t e drum of blades or leaves, a hub secured to one of said heads, and a shaft upon which said hub is mounted, as set forth.

14. A centrifugal fan or pum having a rotary member comprising a p urality of blades or leaves in drum form connected at their ends with zigzag or corrugated uniting strips, flanged heads secured to the ends of the drum of blades or leaves, a hub secured to one of said heads, and a series of ropeller like blades extending between said ub and said other head, as set forth.

15. In a centrifu al fan or pum the combination of a suita le casin wit a rotary member comprising-a plura 't of blades or leaves in drum form connecte at their ends with zigzag or corrugated uniting strips, and a frame upon which said drum of blades or leaves is mounted, and a shaft supporting said frame, as set forth.

- MOSES G. HUBBARD.

Witnesses:

WM. E. KNIGHT, LAURA E. MONK.

anged heads fitting over a 

